Tansy Ragwort Weed Alert
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Sunflower Family Tansy Ragwort Jacobaea vulgaris Identification Tips Regulated Class B Noxious First year is spent in rosette stage. Weed: Control Required Leaves are alternately arranged, dark green in color and deeply lobed. Stem is 2-4 feet tall, highly branched near top. Mainly green in color with a purple tint. Plant has deep taproot. Flowers have 13 petals (ray flowers) surrounding a yellow-orange center (disk flowers). Flowers grow in clusters at end of stem. Biology Impacts Biennial or short lived perennial, typically flowering during second year. Plant is toxic to livestock and people, causing irreversible liver damage. Flowers from June to October, starts forming seed in August. Outcompetes and displaces desired forage Reproduces primarily by seed, producing up to crops and native vegetation. 200,000 seeds per plant. Reduces pasture yield. Seeds can remain viable in the soil for over 10 years. Potentially toxic to humans through food chain contamination. Distribution Tansy ragwort will remain in the Native to Eurasia, tansy ragwort can now be rosette stage for found throughout Washington State. its first year. Typically grows in full sun to partial shade. Learn to identify Infests pastures, grasslands and disturbed rosettes for areas such as roadsides and clear-cuts. earliest possible Common in disturbed, overgrazed or poorly detection and managed pastures. control. QUESTIONS? Contact Mason County Noxious Weed Control at: (360) 427-9670 ext. 592 or [email protected] https://extension.wsu.edu/mason/natural-resources/noxious-weed-program/ 05-26-2020 H. Steinbach What You Can Do Can be confused with Class C Noxious Weeds St. Johnswort and common tansy Control of tansy ragwort is a legal requirement in Mason County. Help us stop the spread of this Common tansy (Tanacetum noxious weed. Check your property and nearby roads regularly for flowering plants. By stopping seed vulgare) has button-like production and eliminating existing plants, we can flowers and lacks ray flowers keep this toxic plant from harming animals. Contact or "petals". Leaves are deeply the Mason County Noxious Weed Control Board if you toothed and look similar to a see tansy ragwort on roads or neighboring properties. fern. Control Methods Common St. Johnswort Survey area to identify infestations. Tansy ragwort is (Hypericum perforatum) has easiest to identify while it is in bloom. Choose one or a five petals surrounding many combination of control methods suitable for your site. stamens. Leaves have Control should be carried out over several growing distinct perforations (holes) seasons to be successful. Contact Mason County when held up to the light. Noxious Weed Control Board for more information. Prevention Mechanical Look for seeds and weeds in fill dirt and hay. Survey Mowing is not an effective method of controlling tansy yours, and neighboring properties for tansy rosettes in ragwort. It will delay blooming, but plants will resprout the spring. Reseed bare areas in yard and pasture to and flower again. Mowed plants can continue as add competition. To prevent the spread of tansy short-lived perennials until given the opportunity to ragwort always clean equipment and clothes that have bloom and produce seed. been used in an infested area. Chemical Manual Control Choose a formulation that is appropriate for your site, Hand pulling can work to control small infestations of consider if you have site restrictions (such as grazing or tansy ragwort. The best time to pull plants is after haying). Follow the label exactly as written and use only at they bolt, but before flowering. Due to the toxicity you rate prescribed. Do not apply herbicide over or near water will need gloves and protective clothing while bodies. handling plant material. Dispose of plants in a sealed Herbicide treatments can be effective at controlling plastic bag, as plants can produce viable seed even large infestations of tansy ragwort. A selective after they are pulled. Take care to not break the herbicide, containing triclopyr or aminopyralid, will be taproot, as roots can re-sprout and grow into new effective against tansy ragwort. Selective herbicides plants. Monitor location for several years and perform will only affect broadleaf plants and will not injure follow-up control when needed. Reseed and replant grasses. Treatments using herbicide should be carried area to add competition and reduce future out in the spring and fall, and work best on plants in infestations. rosette stage. Keep livestock away from sprayed plants for 1-2 weeks or as directed by label, whichever is longer. Do not cut plants right before or after applying herbicide; adequate leaf surface area is needed for herbicide uptake. Follow-up with manual control on isolated patches. Contact the Mason County Noxious Weed Control Board with questions about Field of tansy ragwort going to seed. This property owner herbicide application. thought they had beautiful wildflowers. Don't be fooled by tansy ragwort! .